Always Save Card on Checkout - Stripe Plugin - Woocommerce

functions.php

<?php

/**
* Auto check Save to Account -- By Darshan Gada
*/
// Hook in
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );

// Our hooked in function - $fields is passed via the filter!
function custom_override_checkout_fields( $fields ) {
     $fields['billing']['wc-stripe-new-payment-method'] = array(
        'type'          => 'text',
        'label'         => '',
        'label_class'   => array('hidden'),
        'required'      => true,
        'class'         => array('hidden'),
        'default'       => '1',
        'clear'         => true
     );

     return $fields;
}

?>

don't work